nordic loop antenna nan400-03

How to Design loop ant on PCB?
and calculate Radiation resistance & inductance ,capacitance of it ?
:D

Here, there are some info

Forget that it says for RFID, it works also for highter frequencies

The file "calculo de antenas para RFID.pdf" is downloadable from Microchip site .

Check out these links:
PCB Antennas
http://www.wirelessworldag.ch/appnotes/rfm/antennas.pdf
Small Loop Antenna Matching
http://ww1.microchip.com/downloads/e...tes/00831b.pdf
Small Loop Antenna naN400-03
http://www.microem.ru/pages/nordic/b...tesallnRFn.pdf
Maybe they will be of any use to you ..

Regards,
IanP

it is only for RFID
If i will use 100MHz, how can I do?

First, I think you know that you are sure that there will be no ground plane on your loop antenna. Otherwise, it will not work.
Second, if you have HFSS, that is going to be very easy. Just put your trace on the pcb substrate.
Third, if you have no HFSS, you can still be able to do it. Find a textbook, trying to find an easy equation (without pcb). It should be close to your desired antenna. Then you can adjust your design. The pcb will just shift the resonant frequency a little bit.
I hope this will help you.

Can on pcb antennas work for frequencies less than 100 MHz?